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https://twitter.com/bdbrode/status/666359351980920832
A class card is 4x more likely to be discovered.
Sorry we didn't make that more clear during the announcement.
简单的说就是Brode在推特上做出官方说明，
职业卡对于中立卡来说，
有4倍的机率在"发现"机制中出现。
(也就是说，带有"发现"比原先预期的还强，)